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US 7,443,147 B2Granted
DC-DC converter with step-up and step-down control capable of varying the offset voltage of the PWM triangle
AssigneeFujitsu Limited
InventorsToshihiko Kasai, Yoshihiro Kizaki, Hidenobu Ito
Life of this patent
Estimating the term…
Abstract
When both step-up PWM control and step-down PWM controls are executed, the offset of the ON/OFF switching timing for step-up PWM control and/or the offset of ON/OFF switching timing for step-down PWM control are changed to become identical. By synchronizing ON/OFF switching timing for step-up PWM control and ON/OFF switching timing for step-down PWM control, the loss on switching can be reduced.
Claims7
A DC-DC converter control apparatus for controlling a DC-DC converter to convert an input voltage into a predetermined output voltage by making said DC-DC converter execute at least one of a plurality of kinds of PWM controls, comprising:
- a differential output circuit for generating a signal corresponding to a difference between an output voltage and a predetermined voltage;
- an offset change circuit for receiving the signal generated from the differential output circuit, and for changing offset of ON/OFF switching timing for PWM control on the basis of a kind of said plurality of PWM controls under execution by said DC-DC converter;
- an oscillator for generating a triangular wave signal;
- a step-up comparator circuit for comparing signals generated from said oscillator and said differential output circuit and generating a step-up PWM control signal corresponding to a comparison result;
- and
- a step-down comparator circuit for comparing signals generated from said oscillator and said differential output circuit and generating a step-down PWM control signal corresponding to a comparison result,
- wherein said plurality of kinds of PWM controls includes step-up PWM control, step-down PWM control, and both of step-up PWM control and step-down PWM control, and
- wherein said offset change circuit changes offset of the triangular wave signal generated from said oscillator so as to change offset of ON/OFF switching timing for step-up PWM control and/or offset of ON/OFF switching timing for step-down PWM control on the basis of a kind of PWM control under execution by said DC-DC converter.
5 more elements
A DC-DC converter control apparatus for controlling a DC-DC converter to convert an input voltage into a predetermined output voltage by making said DC-DC converter execute at least one of a plurality of kinds of PWM controls, comprising:
- an offset change circuit for changing offset of ON/OFF switching timing for PWM control on the basis of a kind of said plurality of PWM controls under execution by said DC-DC converter;
- a differential output circuit for generating a signal corresponding to a difference between an output voltage and a predetermined voltage;
- an oscillator for generating a triangular wave signal;
- a step-up comparator circuit for comparing signals generated from said oscillator and said differential output circuit and generating a step-up PWM control signal corresponding to a comparison result;
- and
- a step-down comparator circuit for comparing signals generated from said oscillator and said differential output circuit and generating a step-down PWM control signal corresponding to a comparison result,
- wherein said plurality of kinds of PWM controls includes step-up PWM control, step-down PWM control, and both of step-up PWM control and step-down PWM control,
- wherein said offset change circuit changes offset of the triangular wave signal generated from said oscillator so as to change offset of ON/OFF switching timing for step-up PWM control and/or offset of ON/OFF switching timing for step-down PWM control on the basis of a kind of PWM control under execution by said DC-DC converter, and
- wherein said offset change circuit, when kinds of PWM control under execution by said DC-DC converter are both of step-up PWM control and step-down PWM control, changes offset of ON/OFF switching timing for step-up PWM control and/or offset of ON/OFF switching timing for step-down PWM control by changing offset of the triangular wave signal generated from said oscillator so that the offset of ON/OFF switching timing for step-up PWM control and the offset of ON/OFF switching timing for step-down PWM control become identical.
6 more elements
A power supply apparatus including a DC-DC converter control apparatus for controlling a DC-DC converter to convert an input voltage into a predetermined output voltage by making said DC-DC converter execute at least one of a plurality of kinds of PWM control, wherein
- said DC-DC converter control apparatus comprises:
- a differential output circuit for generating a signal corresponding to a difference between an output voltage and a predetermined voltage;
- an offset change circuit for receiving the signal generated from the differential output circuit, and for changing offset of ON/OFF switching timing for PWM control on the basis of a kind of said plurality of PWM controls under execution by said DC-DC converter;
- an oscillator for generating a triangular wave signal;
- a step-up comparator circuit for comparing signals generated from said oscillator and said differential output circuit and generating a step-up PWM control signal corresponding to a comparison result;
- and
- a step-down comparator circuit for comparing signals generated from said oscillator and said differential output circuit and generating a step-down PWM control signal corresponding to a comparison result,
- wherein said plurality of kinds of PWM control includes step-up PWM control, step-down PWM control, and both of step-up PWM control and step-down PWM control,
- wherein said offset change circuit changes offset of the triangular wave signal generated from said oscillator so as to change offset of ON/OFF switching timing for step-up PWM control and/or offset of ON/OFF switching timing for step-down PWM control on the basis of a kind of PWM control under execution by said DC-DC converter, and
- wherein said DC-DC converter control apparatus controls said DC-DC converter to convert voltage.
7 more elements
A power supply apparatus including a DC-DC converter control apparatus for controlling a DC-DC converter to convert an input voltage into a predetermined output voltage by making said DC-DC converter execute at least one of a plurality of kinds of PWM control, wherein said DC-DC converter control apparatus comprises:
- an offset change circuit for changing offset of ON/OFF switching timing for PWM control on the basis of a kind of said plurality of PWM controls under execution by said DC-DC converter;
- a differential output circuit for generating a signal corresponding to a difference between an output voltage and a predetermined voltage;
- an oscillator for generating a triangular wave signal;
- a step-up comparator circuit for comparing signals generated from said oscillator and said differential output circuit and generating a step-up PWM control signal corresponding to a comparison result;
- and
- a step-down comparator circuit for comparing signals generated from said oscillator and said differential output circuit and generating a step-down PWM control signal corresponding to a comparison result,
- wherein said plurality of kinds of PWM control includes step-up PWM control, step-down PWM control, and both of step-up PWM control and step-down PWM control,
- wherein said offset change circuit changes offset of the triangular wave signal generated from said oscillator so as to change offset of ON/OFF switching timing for step-up PWM control and/or offset of ON/OFF switching timing for step-down PWM control on the basis of a kind of PWM control under execution by said DC-DC converter,
- wherein said DC-DC converter control apparatus controls said DC-DC converter to convert voltage, and
- wherein said offset change circuit, when kinds of PWM control under execution by said DC-DC converter are both of step-up PWM control and step-down PWM control, changes offset of ON/OFF switching timing for step-up PWM control and/or offset of ON/OFF switching timing for step-down PWM control by changing offset of the triangular wave signal generated from said oscillator so that the offset of ON/OFF switching timing for step-up PWM control and the offset of ON/OFF switching timing for step-down PWM control become identical.
7 more elements
An electronic equipment including a DC-DC converter control apparatus for controlling a DC-DC converter to convert an input voltage into a predetermined output voltage by making said DC-DC converter execute at least one of a plurality of kinds of PWM controls, wherein
- said DC-DC converter control apparatus comprises:
- a differential output circuit for generating a signal corresponding to a difference between an output voltage and a predetermined voltage;
- an offset change circuit for receiving the signal generated from the differential output circuit, and for changing offset of ON/OFF switching timing for PWM control on the basis of a kind of said plurality of PWM controls under execution by said DC-DC converter;
- converter execute at least one of a plurality of kinds of PWM controls, wherein said DC-DC converter control apparatus comprises:
- an offset change circuit for changing offset of ON/OFF switching timing for PWM control on the basis of a kind of said plurality of PWM controls under execution by said DC-DC converter;
- a differential output circuit for generating a signal corresponding to a difference between an output voltage and a predetermined voltage;
- an oscillator for generating a triangular wave signal;
- a step-up comparator circuit for comparing signals generated from said oscillator and said differential output circuit and generating a step-up PWM control signal corresponding to a comparison result;
- and
- a step-down comparator circuit for comparing signals generated from said oscillator and said differential output circuit and generating a step-down PWM control signal corresponding to a comparison result,
- wherein said plurality of kinds of PWM control includes step-up PWM control, step-down PWM control, and both of step-up PWM control and step-down PWM control,
- wherein said offset change circuit changes offset of the triangular wave signal generated from said oscillator so as to change offset of ON/OFF switching timing for step-up PWM control and/or offset of ON/OFF switching timing for step-down PWM control on the basis of a kind of PWM control under execution by said DC-DC converter,
- wherein said DC-DC converter control apparatus controls said DC-DC converter to convert voltage, and
- an oscillator for generating a triangular wave signal;
- a step-up comparator circuit for comparing signals generated from said oscillator and said differential output circuit and generating a step-up PWM control signal corresponding to a comparison result;
- and
- a step-down comparator circuit for comparing signals generated from said oscillator and said differential output circuit and generating a step-down PWM control signal corresponding to a comparison result,
- wherein said plurality of kinds of PWM control includes step-up PWM control, step-down PWM control, and both of step-up PWM control and step-down PWM control,
- wherein said offset change circuit changes offset of the triangular wave signal generated from said oscillator so as to change offset of ON/OFF switching timing for step-up PWM control and/or offset of ON/OFF switching timing for step-down PWM control on the basis of a kind of PWM control under execution by said DC-DC converter, and
- wherein said DC-DC converter control apparatus controls said DC-DC converter to convert voltage.
17 more elements
An electronic equipment including a DC-DC converter control apparatus for controlling a DC-DC converter to convert an input voltage into a predetermined output voltage by making said DC-DC
- wherein said offset change circuit, when kinds of PWM control under execution by said DC-DC converter are both of step-up PWM control and step-down PWM control, changes offset of ON/OFF switching timing for step-up PWM control and/or offset of ON/OFF switching timing for step-down PWM control by changing offset of the triangular wave signal generated from said oscillator so that the offset of ON/OFF switching timing for step-up PWM control and the offset of ON/OFF switching timing for step-down PWM control become identical.
A control method for DC-DC converter for controlling, by control apparatus, a DC-DC converter to convert an input voltage into a predetermined output voltage by making said DC-DC converter execute at least one of a plurality of kinds of PWM control,
- wherein said control apparatus comprises:
- a differential output circuit for generating a signal corresponding to a difference between an output voltage and a predetermined voltage;
- an offset change circuit for receiving the signal generated from the differential output circuit, and for changing offset of ON/OFF switching timing for PWM control on the basis of a kind of said plurality of PWM controls under execution by said DC-DC converter;
- an oscillator for generating a triangular wave signal;
- a step-up comparator circuit for comparing signals generated from said oscillator and said differential output circuit and generating a step-up PWM control signal corresponding to a comparison result;
- and
- a step-down comparator circuit for comparing signals generated from said oscillator and said differential output circuit and generating a step-down PWM control signal corresponding to a comparison result;
- said method comprising steps of:
- identifying a kind of PWM control under execution by said DC-DC converter;
- and
- by said control apparatus, when kinds of PWM control under execution by said DC-DC converter are both of step-up PWM control and step-down PWM control, changing offset of ON/OFF switching timing for step-up PWM control and/or offset of ON/OFF switching timing for step-down PWM control by changing offset of the triangular wave signal generated from said oscillator so that the offset of ON/OFF switching timing for step-up PWM control and the offset of ON/OFF switching timing for step-down PWM control become identical.
8 more elements
Dependencies are inferred from the claim text.